PROTOMONADINA 5! 



confirmed the relative frequency of the species. In Konigsberg, 

 Prussia, a student found encysted Lamblice in his faeces. One 

 case is reported from Finland by Sievers, 1 another case from Scan- 

 dinavia by Miiller. 2 Frshezjesski* reports cases from Russia, but 

 I have not had the opportunity of reading his article on the sub- 

 ject. Jaksch 4 announces the occurrence of the parasite in Aus- 

 tria ; Piccardi 5 mentions their presence again in Italy ; and we 

 hear of them in Egypt from Kruse and Pasquale. 6 Finally, the 

 structure of Lamblia intestinalis has been recently described by 

 Metzner. 7 



B. Protomonadina, Blochm. 



The diminutiveness of the Protomonadines and their less super- 

 ficial situation than the Polymastigines, is the cause that, at least 

 in regard to the species occurring in man, they are very little 

 known. As regards parasitical species,, this group maybe divided 

 as follows, according to the number of flagella and the presence 

 or absence of an undulating membrane : 



(1) Cercomonadidtz, with one flagellum at the anterior extremity, without 

 an undulating membrane. 



(2) Bodonidte, with two flagella, without an undulating membrane. 



(3) Trypanosomida, with one flagellum and an undulating membrane 

 along the entire length of the body. 



i. Cercomonas hominis, Davaine, 1854. 



Davaine 8 found Flagellata in the evacuations of cholera patients. 

 They had pear-shaped bodies elongated to a point posteriorly. 

 Their length averaged from O-QIO 0-012 mm., and a flagellum 



1 Sievers, " Balant. coli, Meg. ent. u. Bothr. latus bei ders. Pers." (Ztschr. /. klin. 

 Med., 1896, xxxiii., p. 25). 



- Miiller, E., " Cercom. intest. i. jejunum fran mdnn. " (Nord. med. ark. 1889, xxi., 

 No. 21 ) ; Forhdlg. biol. Fo'ren., Stockholm, 1890, ii., p. 42 ; ref. in C. /. B. u. P., 1890, 

 viii., p. 592. 



3 Frshezjesski, " Ueb. d. Rolle d. Meg. enter, bei chronisch. Darmcatarrh." (Russk. 

 Arch. Patol., klin. Med. i. Bakt., 1897, ii.). 



4 Jaksch, v., " Ueb. d. York. v. thier. Paras, in d. Faces d. Kind " (Wien. kl. Wochen- 

 schr., 1888, No. 25, p. 511). 



5 Piccardi, "Ale. prat, delle fed del I'uomo " (Giorn. R. Accad. med., Torino, 1895, 

 Iviii., i); Progr. medical, 1895, No. 23, p. 377. 



Kruse, W., and A. Pasquale, " Unters. ub. Dysent. u. Leberabscess " (Z^chr. /. 

 Hyg., 1894, xvi., p. 19). 



7 Metzner, R., " Unters. an Meg. enter, a. d. K ani,nchendarm " (Ztschr. /. w. Zoo., 

 1901, Ixx., p. 299). 



8 Davaine, C., " Sur des animalcules in/us, trouv. dans les selles d. mal. att. du chol, 

 et d'autres mal." (C. R. soc. biol., Paris, 1854, 2 . *> P- I2 9)- 



